Add IME_ACTION_SEARCH for search input

Which is the correct key because the EditText specified
`imeOptions="actionSearch"`.

Author: markusfisch

app/src/main/java/de/markusfisch/android/pielauncher/activity/HomeActivity.java

@@ -188,6 +188,7 @@ public void afterTextChanged(Editable e) {
 				case EditorInfo.IME_ACTION_SEND:
 				case EditorInfo.IME_ACTION_DONE:
 				case EditorInfo.IME_ACTION_NEXT:
+				case EditorInfo.IME_ACTION_SEARCH:
 				case EditorInfo.IME_NULL:
 					if (searchInput.getText().toString().length() > 0) {
 						pieView.launchFirstApp();